The sages collected sharp observations about who people tend to be and why. Most donkey drivers, they said, are rough with their customers, but most sailors are pious, because anyone who has stood on a pitching deck learns to pray. The best physicians, they warned, are destined for Gehinnom, meaning those who grow so confident in their skill that they neglect the poor patients who cannot pay them. The most upright butcher, they said, is still a partner of Amalek, because the trade of slaughter dulls the soul unless a person works hard against it.
Bastards are often cunning, the sages observed, because they have to use their wits to survive a world that mocks their birth. Servants tend to be handsome, because a household chooses them that way. Those from good families are often bashful, since they grew up being watched. Children, they noticed, most often resemble their mother's brother in looks and temperament, a quiet reminder that a man who wants to know the stock he is marrying into should study the uncle as carefully as the bride.
One of the sharpest sayings in the collection comes from Rabbi Shimon ben Yochai. He said that in time of war, one must be ready to strike down the best of the enemy and the head of the most dangerous serpent, because mercy in the wrong moment turns into suicide. He also said that the most attractive woman is the one capable of the deepest witchcraft, meaning that beauty untied from character is a weapon. The tractate closes with the sentence that balances all these warnings: "Blessed is the one who does the will of God." (Sopherim 15:10).
The list is not a sociology. It is a map of temptations, pointing to where each kind of soul has to work hardest.